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34I.3 Under Tweeks (Read 1338 times)
4krow
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34I.3 Under Tweeks
03/17/14 at 20:43:45
 
Recently, after having got my Rachel in, I set out for a few changes. I liked the mono volume controls very much, but decided to get a stepped attenuator for both channels. One of the things important to me was to have an exact idea where the settings for each was, at a glance. To do this, I found some indicator dials made by Ohmite. Couldn't have worked out better. I had to enlarge the center hole, so that the dials could fit over the controls, and I had to carefully drill and ream a hole in the aluminum chassis to mount these controls, but in the end, it was worth it. Also, since I was in the neighborhood, I decided also to add a selector switch. Quality was a key consideration, and I found what I was looking for. It is a Russian surplus Military switch, which is NOS. Very well made with silver contacts.  Lastly, for a time in the near future, I mounted DPDT silver contact switches to employ a 60Hz filter, if I am wanting to use this amp for a HT input. This switch will only control input #3 so as not to be in the circuit for inputs 1 and 2. As things move along, I will show the underside of the wiring,etc.
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« Last Edit: 04/13/14 at 22:51:24 by 4krow »  

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Lon
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Re: 34I.3 Under Construction
Reply #1 - 03/17/14 at 23:30:41
 
You're a clever man! Good work, you're making it your own.
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4krow
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Re: 34I.3 Under Construction
Reply #2 - 03/17/14 at 23:38:59
 
Thank you Lon, and never done it seems. In this case, for whatever reason, the new attenuaters were not doing enough, so I added an 82k resistor in series, and 4.7k to ground for each channel. Now, it seems that I would be much better off with about 10k to ground, as this combination of resistors would yield a -25db attenuation to the signal before it gets to the stepped attennuators. This gives a more middle of the road adjustment on the controls. Right now, as is I am getting good sound at nearly full volume, but the idea is to be about at a 12 o'clock or so.
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4krow
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Re: 34I.3 Under Construction
Reply #3 - 03/19/14 at 23:00:31
 
New binding posts came in yesterday. Changed strictly for cosmetic preference. On the bottom side, I ended up not using the screw terminals, but instead, wired in a patch of Maple Shade speaker wire that handles solder nicely. The output wires from the transformer were a hair short for my intentions, but it still turned out well with this patch in between.
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4krow
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Re: 34I.3 Under Construction
Reply #4 - 04/01/14 at 17:26:53
 
'Construction Complete'  may be the new title here. I had to adjust the value of the filter for the 34.3 to work with a sub amp, but now have what I need at .22uf capacitance. You can see them at the selector switch that is in between the two attenuators.
 On the rear of the unit, inserted resistors of 300k to match the  SO(sub output). They are concealed in heatshrink and are wired from input 3 to SO.
I have replaced all input wire with a Kapton sleeved, shielded silver wire.
I have added damping sheets at certain points of the chassis, such as under the output transformers, and by the input tubes.
Speaker terminals were replace with red copper short post types. The wire was extended from the output transformers with Mapleshade speaker wire.
As mentioned earlier, the original volums controls were replaced by stepped attentuators sporting dale resistors.
I think that it is time to put things back together and be happy for a long time.
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« Last Edit: 04/01/14 at 17:27:54 by 4krow »  

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4krow
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Re: 34I.3 Under Construction
Reply #5 - 04/01/14 at 17:29:38
 
Since I have tried everything RATIONAL to post more than one foto, I will just do it post by post!
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4krow
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Re: 34I.3 Under Construction
Reply #6 - 04/01/14 at 17:30:58
 
next
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« Last Edit: 04/01/14 at 17:32:08 by 4krow »  

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Lonely Raven
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Re: 34I.3 Under Construction
Reply #7 - 04/07/14 at 18:36:33
 

Nice clean looking work!

What resistors did Steve use on the input sockets? The ones that look like little blue pills I mean. I'm not familiar with them.

Also, see my guide for how to add photos.

http://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1388257078
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4krow
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Re: 34I.3 Under Construction
Reply #8 - 04/08/14 at 01:41:49
 
Actually, I looked at them but saw no makers mark. I have not seen them before either.
I do appreciate the help with photo trouble here. I did try your advice once, but frankly, I just don't know enough computer talk to get it done. In my world, things have to be straightforward and nothing is assumed. I mean I would have just have a button to push once, not a string of things to get something to work.
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4krow
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Re: 34I.3 Tweek
Reply #9 - 04/13/14 at 22:30:31
 
It's never really over for me. I am trying a tweek to the Rachel. Not because it needs it mind you, but i always wan t to know 'what if'. In this round, I am using 'Mad Scientist' 'Black Discus' Don't ask me what these are, 'cuz the MS won't divulge their product. Instead, you can only ask what it is they do. I have NOT fully tested them, but I am telling myself so far that I hear better bass and clearer treble. Am I? Time will tell. I did order a few more to experiment with. Right now, I only have the free sample that MS gives out. I really think that it would be better to try them with a head phone set up, because of the better possibility that could be heard. I will try them tomm on my SACD player which has a head phone output. More to come, and I promise some photos. I might even try doing it the right way this time through Photobucket.
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Re: 34I.3 Under Tweeks
Reply #10 - 04/15/14 at 18:40:57
 
Ok this would be a step too far, but back to the tweek of the week thinking. I put on the most irritating digital disc that I have SuperTramps' Breakfast in America. Yeeeow! this thing is harsh. No I have added the disc to the 34.III amp. Still not listenable, BUT a bit better than before. It's the edge of that harshness that really sends me. It is a bit less. More to follow when the big discs arrive.
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Re: 34I.3 Under Tweeks
Reply #11 - 04/15/14 at 21:09:22
 
I received the bigger discs a few weeks ago but haven't really done any testing.  I'll give them the Breakfast in America test.
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Re: 34I.3 Under Tweeks
Reply #12 - 04/16/14 at 01:28:28
 
I just wanted to see if I can share a picture of my SE34I.32. I cannot really tell if the brass weights may a real difference in the sound. But, I think it helps couple the amp to the powerbase.

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Re: 34I.3 Under Tweeks
Reply #13 - 04/16/14 at 01:31:08
 
Interesting buster. I use former Mapleshade brass footers as weights for my Mk III. They do make a difference for me, and I think it's in part that they assist the coupling to the Powerbase. Smiley
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4krow
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Re: 34I.3 Under Tweeks
Reply #14 - 04/16/14 at 02:55:25
 
Buster,
 So did you place all of the weights on at once, or did you try them, like one, then two, then three, etc. I am curious because I have heard that they can overdamp, which sounds odd to me in the first place.
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Re: 34I.3 Under Tweeks
Reply #15 - 04/17/14 at 00:07:54
 
I did most of them at one time.

Mapleshade recommends trying one at a time. I did not have time for that. I wanted to just enjoy the sound. I did not want spend what listening time I have trying to figure out if I hear a difference.

I rearranged my systems, had the brass lying around, and decided to use them.

I was inspired by the brass screws in your amp, and the fact that the current production has a heavier plate.
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4krow
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Re: 34I.3 Under Tweeks
Reply #16 - 04/17/14 at 00:47:19
 
Yah, I have a bit of a love affair with brass myself. I upgrade Carver C9 units. This includes a great paint job and brass screws, besides the circuit upgrades. I just think that brass looks classy, and is worth the cost. FWIW, Lee Valley sells brass discs that are intended for tracing. I have used them for anything but that. And they are relatively inexpensive.
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4krow
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Re: 34I.3 Under Tweeks
Reply #17 - 04/22/14 at 16:17:38
 
As stated, I am reporting on the effects of the 'Mad Scientist' Black Discus in my system. First of all, I haven't done that much listening since yesterday, when the shipment arrived. My initial listening has first been with the samples that were sent, and I did in fact, hear a distinct difference in the presentation of the music. This  involved mostly the bass and treble. Treble being less sibilant, and 'digital', and bass being a bit more defined.
So now that the purchased discs have a arrived, I can only hear a difference, whatever that might be. More specifically, the two areas touched are the bass and treble. And again, much to the same results. Having said that, I think that there is a line not to cross when it comes to devices such as these. I am already thinking that a little is good, but more, not so much. This may be premature, and I will add comments to this as it develops. I suspect that certain recordings are more in need of these effects than others. Fortunately, I finally have a system that can bear out the differences made.
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Re: 34I.3 Under Tweeks
Reply #18 - 05/12/14 at 18:38:28
 
 This is not a conclusion, but rather an update for my experience with the discs. I have used these for a short time now, and though I appreciate their effect, I am still of the opinion that one or two of these devices is adequate for my system. I do however, have a new CD player on the way from Emotiva. This may change my experience with these discs. I actually hope that it does not. If the new player sounds better with them, then it might cast a shadow on my expectations of the new player. I will keep an open mind and post my experience at a later date.
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Lon
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Re: 34I.3 Under Tweeks
Reply #19 - 05/12/14 at 18:59:20
 
Interesting!

You know, it will be interesting to see if the discs improve your new player. That might be because the player is more revealing? So it could mean that it's a better player?

Isn't this crazy hobby maddening sometimes!?
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4krow
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Re: 34I.3 Under Tweeks
Reply #20 - 05/17/14 at 16:13:54
 
Well, I am doing things a bit backwards. I have placed the disc on the new player's power cord. I am using a Pangea 14-SE, 1/2 meter cord. What I am noticing immediately, is the background detail in music that I knew was there, but now is separated into more specific instruments, or ambience, or whatever it is that was homoginized before.
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